M48T37Y
M48T37V
5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM
Features
■
Integrated ultra low power SRAM, real-time
clock, power-fail control circuit, and battery
■
Frequency test output for real-time clock
software calibration
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Automatic power-fail chip deselect and WRITE
protection
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Watchdog timer
■
WRITE protect voltage
(VPFD = Power-fail deselect voltage):
– M48T37Y: VCC = 4.5 to 5.5 V
4.2 V ≤ VPFD ≤ 4.5 V
– M48T37V: VCC = 3.0 to 3.6 V
2.7 V ≤ VPFD ≤ 3.0 V
SNAPHAT® (SH)
Battery/crystal
44
1
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Packaging includes a 44-lead SOIC and
SNAPHAT® top (to be ordered separately)
■
SOIC package provides direct connection for a
SNAPHAT® top which contains the battery and
crystal
■
Microprocessor power-on reset (valid even
during battery backup mode)
■
Programmable alarm output active in the
battery backup mode
■
Battery low flag
■
SOH44 (MH)
44-pin SOIC
RoHS compliant
– Lead-free second level interconnect
August 2010
Doc ID 7019 Rev 9
1/30
www.st.com
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